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Best SpeedX Alternatives
Here are some Firefox add-ons that are similar to SpeedX:
Video Speed Controller
Acker
2 0.00 
(0) 
SpeedZ
Acker2
1 0.00 (0) 
SpeedyVideo Extension
Great Idea Technology Limited
436 5.00 (4) 
Video Playback Speed Adjuster
minhquangdn
15 0.00 (0) 
VideoSpeed FX
fe2-Nyxar
5 5.00 (1) 
speederVideo
haleem
7 0.00 (0) 
YT Speed
Arimtak
5 5.00 (1) 
FastForwarder
Nick
45 0.00 (0) 
Video Speed Controller
seoxiis
244 3.00 (4) 
Video Speed Controller
codebicycle
101K 4.53 (797) 
Custom Video Speed Controller
Hugo Nordström
- 0.00 (0) 
Video Speed Controller X
Danny Lin
12 0.00 (0)